This paper fully introduces the features and the approaches of the implementation for the dataflow prototype SDS-1.This prototype is the computer which combines the synchronous mechanism with the asynchronous one and the dataflow with control-flow. The parallel of composite function level's can be developed in SDS-l. The prototype SDS-l has been implemented on the tightlycoupled multicomputer system consisting of a microcomputer Intel86/310 and eight single-board computers Inte186/12. The prototype system has reached the advanced technical world level the beginning of 1980's.